Observation of soft Leggett mode in superconducting CaKFe4As4
S. Z. Zhao, Hai-Ying Song, L. L. Hu, T. Xie, C. Liu, H. Q. Luo, Cong-Ying Jiang, Xiu Zhang, X. C. Nie, Jian-Qiao Meng, Yu-Xia Duan, Shi-Bing Liu, Hong-Yi Xie, H. Y. Liu
DOI 10.1103/PhysRevB.102.144519 · Physical Review B
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Abstract
We study the ultrafast dynamics of the multiband iron-based superconductor CaKFe4As4 via time-resolved optical reflectivity. We observe a long-lived 5- GHz oscillation of the reflection changes within the superconducting regime. We assign this low-frequency oscillation to a soft Leggett mode associated with the collective fluctuation of multiple phase differences between Cooper pair condensates. Our observation evidences the presence of the time-reversal-symmetry breaking state in superconducting CaKFe4As4.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaKFe4As4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
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